Table 3.

Overall agreement between respondent reports and claims data

	++	+−	−+	−−	Obs (%)	κ	95% CI
Outpatient visits	411	22	93	16	79	0.13	0.00, 0.27
ED visits	189	24	85	244	80	0.60	0.53, 0.67
Admissions	114	17	23	388	93	0.80	0.74, 0.86

Notes: ++, visit present in claims data and self-reported; +−, visit present in claims data but not self-reported; 3−, visit not present in claims data but self-reported; −−, no visit present in claims data and no self-reported visit.

Recall period was 6 months for outpatient visits and was the past year for ED visits and admissions.

Abbreviations: Obs, observed agreement; CI, confidence interval.